code: def __call__(cls, s, posix_offset=False):
      key = (s, posix_offset)
      instance = cls.__instances.get(key, None)
  
      if instance is None:
          instance = cls.__instances.setdefault(
              key, cls.instance(s, posix_offset)
          )
  
      # This lock may not be necessary in Python 3. See GH issue #901
      with cls.__cache_lock:
          cls.__strong_cache[key] = cls.__strong_cache.pop(
              key, instance
          )
  
          # Remove an item if the strong cache is overpopulated
          if len(cls.__strong_cache) > cls.__strong_cache_size:
              cls.__strong_cache.popitem(last=False)
  
      return instance
  
file_path: catboost/contrib/python/python-dateutil/py3/dateutil/tz/_factories.py
imports: from datetime import timedelta
  import weakref
  from collections import OrderedDict
  from six.moves import _thread
label_desc: Use image node_id 2 for calling the _TzStrFactory obj's underlying member method code with example usage: obj.__call__(cls, s, posix_offset) and returns: instance